Suffragan Diocese
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A suffragan diocese is a diocese in the Catholic Church that is overseen not only by its own bishop but also by a metropolitan bishop. The metropolitan bishop is always an archbishop who governs a diocese strictly his own, while he presides at the same time over the bishops of a well-defined ecclesiastical province composed of his suffragan dioceses. The bishop of a suffragan diocese is called a suffragan bishop.
Source: "Catholic Encyclopedia"